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An information-theoretic measure of how surprised a language model is by a test set. Lower perplexity means the model assigned higher probability to the test text. Perplexity is the standard intrinsic metric for language model quality but does not capture downstream task performance.
Training reports and base-model comparisons quote perplexity. AI engineers should know its limits before drawing conclusions from a single number.
An information-theoretic measure of how surprised a language model is by a test set. Lower perplexity means the model assigned higher probability to the test text. Perplexity is the standard intrinsic metric for language model quality but does not capture downstream task performance.
Training reports and base-model comparisons quote perplexity. AI engineers should know its limits before drawing conclusions from a single number.
Definitions are original explanations written for career development purposes. For authoritative technical definitions, refer to NIST, ISO, or the relevant standards body.
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